CN106268556B - Preparation method of magnetic beads for protein purification - Google Patents
Preparation method of magnetic beads for protein purification Download PDFInfo
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- CN106268556B CN106268556B CN201610674866.XA CN201610674866A CN106268556B CN 106268556 B CN106268556 B CN 106268556B CN 201610674866 A CN201610674866 A CN 201610674866A CN 106268556 B CN106268556 B CN 106268556B
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- C07K1/00—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length
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Abstract
The invention provides a preparation method of magnetic beads for protein purification. The method comprises the steps of taking chitosan and magnetic powder as raw materials, forming core-shell structure particles of the magnetic powder coated by the crosslinked chitosan under the action of a crosslinking agent, and forming magnetic beads for protein purification through reduction and carboxymethylation. The magnetic beads for protein purification are used for separating and purifying proteins with his-tag, so that the separation efficiency is greatly improved. The invention avoids the problem of protein denaturation which may occur during elution and can improve the separation efficiency of the protein. Meanwhile, the method is convenient to operate, is suitable for separating turbid protein solution, and is particularly suitable for large-scale industrial production.
Description
Technical Field
The invention belongs to the technical field of biology, and particularly relates to a preparation method of magnetic beads applied to protein separation and purification.
Background
The separation and purification of proteins mainly includes salting out, centrifugation, gel electrophoresis, affinity chromatography and other methods. Among them, salting out, centrifugation and gel electrophoresis are limited by factors such as high cost and low efficiency, and are limited in application. Affinity chromatography is that affinity molecules with special structures are made into solid phase adsorbent and placed in a chromatographic column, when the protein mixture to be separated passes through the chromatographic column, the protein with affinity with the adsorbent is adsorbed and retained in the chromatographic column, and then the protein can be separated and purified by elution. At present, for the separation and purification of recombinant proteins, metal chelate affinity chromatography is the most commonly used technical means. The metal chelating affinity chromatography is a technology for separating proteins by utilizing the specific adsorption of amino acids such as histidine, tryptophan, cysteine and the like on the surfaces of the proteins and metal ions. The His-tag technology is to label the target protein to be separated with 4-10 histidines, the histidine residue has 1 imidazole group, and can react with Ni2+、Co2+、Cu2+The metal ions are chelated so as to be specifically adsorbed onto the medium to realize separation. Conventional metal-chelating affinity chromatography media are mostly dextran and agarose, but both types of chromatographyThe medium is complex to prepare, expensive, not pressure-resistant and generally only suitable for laboratories.
As a substitute for dextran and agarose matrices, chitosan has many advantages, such as abundant resources, low price, good biocompatibility, simple ligand coupling method, weak nonspecific adsorption, etc. Chitosan is a natural basic polysaccharide with amino groups at C2 and hydroxyl groups at C3 and C6, and can react with various cross-linking agents containing aldehyde groups, thus being easily derivatized. At present, the development of the application of chitosan is mainly focused on the field of wastewater treatment. CN201010610928.3 discloses a method for preparing magnetic chitosan microspheres in 7.27.2011, which comprises mixing chitosan with Fe3+，Fe2+The solution is mixed under acidic condition, then the mixed solution is dripped into alkaline solution for precipitation reaction, and the obtained precipitate is the magnetic chitosan microsphere. The magnetic chitosan microspheres prepared by the method are distributed on the surface layer, and the chitosan is not subjected to cross-linking agent to enhance mechanical strength, has poor bearing capacity, is not suitable for separation and purification of protein, and is only suitable for sewage treatment or used as a drug carrier. CN201510622284.2 discloses a method for preparing magnetic particles of furfural modified crosslinked chitosan chelate resin in 2015, 12 months and 23 days, which comprises the following steps: 1. preparing furfural-modified chitosan by taking furfural as a raw material and chitosan as a matrix; 2. and (3) crosslinking the furfural modified chitosan by using glutaraldehyde as a crosslinking agent, and coating the furfural modified chitosan on the surface of the particles to obtain the furfural modified crosslinked chitosan chelating resin magnetic particles. The invention adopts furfural to modify chitosan, so as to introduce more N atoms and O atoms and increase the number of atoms which can be paired with metal ions in resin. The treatment method is effective for recovering and adsorbing heavy metal ions in the industrial wastewater pollution, but is not applicable because excessive metal ions in metal chelating affinity chromatography lead to protein denaturation. CN201310257075.3 discloses an imidazole and chitosan functionalized magnetic particle and a preparation method thereof in 2013, 10, 9, and the imidazole and chitosan functionalized magnetic particle is prepared by the reaction of magnetic powder, oleic acid, chitosan, imidazole and the like and is used for removing sulfonic acid dye in industrial wastewater.
Disclosure of Invention
The invention aims to provide a preparation method of a magnetic chitosan medium for large-scale protein separation and purification, which is suitable for industrial application. Because the dextran and the agarose resin have the characteristics of low mechanical strength and no pressure resistance, complex preparation process, high price and the like, the two media are not suitable for large-scale purification of protein. Meanwhile, the common cross-linked chitosan also has the problem of extrusion deformation when a larger chromatographic column is filled. In order to solve the above problems, the present invention provides a method for preparing magnetic beads for protein purification. The magnetic beads are formed by crosslinking chitosan on the surfaces of magnetic powder, so that the problem of extrusion deformation of common chitosan resin is avoided; the absence of chelated metal ions inside the particles also avoids the problems caused thereby; meanwhile, the particles have magnetic induction, can be quickly separated from the solution under the action of a magnetic field, are convenient for cleaning of hybrid proteins and elution operation of pure proteins, and are particularly suitable for large-scale industrial production.
Technical scheme of the invention
The invention provides a preparation method of magnetic beads for protein purification, which is characterized in that carboxymethylated cross-linked chitosan envelopes are constructed on the surfaces of the magnetic beads; the structure of the carboxymethylated crosslinked chitosan is as follows:
the preparation method of the magnetic bead for protein purification provided by the invention comprises the following steps:
1. sufficiently dissolving chitosan, pure water and glacial acetic acid to obtain a chitosan solution; the mass percentage concentration of chitosan in the chitosan solution is 0.1-2%;
2. adding magnetic powder into the chitosan solution prepared in the step 1, uniformly stirring, adding a cross-linking agent, adding an alkaline solution to adjust the pH value to 5.5-9.5, and performing an aldehyde-amine condensation reaction to generate cross-linked chitosan;
3. adding NaBH under stirring4Reducing imine to form a stable cross-linked structure;
4. after full washing, adding sodium chloroacetate into the reaction system, controlling the temperature at 80-95 ℃ and the pH value at 8-9, stirring, and generating carboxymethylation reaction to form cross-linked chitosan capable of chelating metal ions, namely magnetic beads for protein purification;
adding the obtained magnetic beads for protein purification into the chelated metal ion solution, uniformly stirring, adding a target protein mixed solution with His-tag, reacting, specifically binding the target protein on the magnetic beads for protein purification, separating the magnetic beads for protein purification by adopting a magnetic adsorption mode, washing impurities by using a buffer solution, and eluting by using an imidazole solution to obtain the purified target protein.
In the step 2, the specification of the magnetic powder is 300-1200 meshes; the cross-linking agent is glyoxal or glutaraldehyde.
The realization process of the magnetic bead for purifying the protein and the modified cross-linked chitosan thereof can be represented by the following reaction formula:
advantageous effects
Aiming at the defects of dextran, agarose and common cross-linked chitosan in the aspect of large-scale protein purification, the invention adopts magnetic beads with a core-shell structure which take magnetic powder as an inner core and modified cross-linked chitosan as an outer shell, has the advantages of multiple aspects, one is that the inner part of the particles is of a solid structure, and the elution of a large amount of internal chelated metal ions is avoided to cause the elution of Ni in eluent2+And Cu2+Excessive metal ions denature the target protein; secondly, because the magnetic beads for protein purification have magnetic inductivity, the magnetic beads can be quickly separated under the action of a magnetic field during separation, and the operation is easy; finally, because of the convenience of magnetic field separation, the turbid cell disruption solution is directly used for purification operation without complicated and troublesome centrifugation or filtration treatment, and is particularly suitable for large-scale production.
Detailed Description
The invention is further illustrated by the following specific examples.
The magnetic powder in the following examples is 600 mesh, purchased from Yutong mineral processing factory, Lingshou county; the deacetylation degree of chitosan was 95%, purchased from Jinhu chitin Co., Ltd, Virginia county.
Example 1
(1) Adding 900ml of pure water into 9g of chitosan, adding 3ml of glacial acetic acid under stirring, fully stirring for dissolving, and cooling to 4 ℃ to obtain a chitosan solution; (2) adding 750g of magnetic powder and 1875ml of distilled water into a 10L reaction system, adding 750ml of chitosan solution prepared in the step (1), adding 37.5ml of cold 4% glyoxal solution under the condition of high-speed stirring, and fully and uniformly mixing; (3) adding 0.2mol/L of K2HPO4Stirring the solution 220ml at high speed for 2 h; (4) adding (NH)4）2SO440g, and simultaneously dynamically adjusting and maintaining the pH of the solution to be about 8.5 by using 1mol/L NaOH solution, and stirring for 2 h; (5) adding NaBH410g, stirring for 2 hours, removing supernatant, and washing with 5L of distilled water for 2 times; (6) adding 66g of sodium chloroacetate, and stirring for 2h at 85 ℃ and under the condition of pH 8.5; (7) and washing the mixture obtained by the steps with distilled water for 2 times to obtain the magnetic beads for protein purification.
Collecting 0.3g (wet) of magnetic beads for protein purification, and adding 0.1mol/l NiSO41ml, mix well for 10min, magnetic suction supernatant, using buffer (containing 0.5mol/L NaCl, 20mmol/L phosphate, pH 7.4) washing 3 times (1 ml 3), adding containing 6His marker penicillin acylase Escherichia coli cell disruption solution, at 4 degrees C constant temperature mixing for 10 min. The supernatant was removed by magnetic aspiration, washed 3 times with 1ml of 0.5mol/L NaCl solution (containing 20mmol/L phosphate, pH 7.4) to remove impurities, and finally eluted three times (0.5 ml. times.3) with eluent (containing 0.5mol/L NaCl and 0.5mol/L imidazole, pH 7.4), and the eluates were combined to give the purified penicillin acylase. The eluate was subjected to SDS-PAGE to obtain the target protein with a purity of about 95%.
Example 2mol/L
(1) Adding 900ml of pure water into 9g of chitosan, adding 3ml of glacial acetic acid under stirring, fully stirring for dissolving, and cooling to 4 ℃ to obtain a chitosan solution; (2) adding 750g of magnetic powder and 1875ml of distilled water into a 10L reaction system, adding 750ml of chitosan solution prepared in the step one, and adding the mixture under the condition of high-speed stirringAdding 37.5ml of cold 4% glutaraldehyde solution, and mixing well; (3) adding 0.2m/L of K2HPO4Stirring the solution 220ml at high speed for 2 h; (4) adding (NH)4）2SO440g, and simultaneously dynamically adjusting and maintaining the pH of the solution to be about 8.5 by using 1mol/L NaOH solution, and stirring for 2 h; (5) adding NaBH410g, stirring for 2 hours, removing supernatant, and washing with 5L of distilled water for 2 times; (6) adding 66g of sodium chloroacetate at 85 ℃ and under the condition of pH 8.5, and stirring for 2 h; (7) and washing the mixture obtained by the steps with distilled water for 2 times to obtain the magnetic beads for protein purification.
The protein purification effect was tested in the same procedure as in example 1, and the results were consistent.
Claims (2)
1. A preparation method of magnetic beads for protein purification is characterized by comprising the following steps: (1) fully dissolving chitosan, pure water and glacial acetic acid to obtain a chitosan solution; the mass percentage concentration of chitosan in the chitosan solution is 0.1-2%; (2) adding magnetic powder into the chitosan solution prepared in the step (1), uniformly stirring, adding a cross-linking agent, and adding an alkaline solution to adjust the p H value to 5.5-9.5; (3) adding NaBH under stirring; (4) adding sodium chloroacetate into the reaction system, and stirring at the temperature of 80-95 ℃ and the value of p H of 8-9 to obtain the magnetic bead for protein purification, wherein the magnetic bead for protein purification is of a core-shell structure with a shell of modified cross-linked chitosan and an inner core of magnetic powder, and the specific structure of the modified cross-linked chitosan is as follows:
2. a method for preparing a magnetic bead for protein purification according to claim 1, wherein: the specification of the magnetic powder is 300-1200 meshes; the cross-linking agent is glyoxal.
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| CN115007118B (en) * | 2022-08-08 | 2022-11-08 | 康盈红莓(中山)生物科技有限公司 | Magnetic bead for separating and purifying protein, cross-linked chitosan thereof, and preparation and use methods thereof |
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| CN101716494B (en) * | 2009-11-18 | 2012-05-30 | 中国科学院生物物理研究所 | Magnetic compatible microsphere for purifying thrombin and preparation method and application thereof |
| CN105170103B (en) * | 2015-09-25 | 2017-10-31 | 哈尔滨工程大学 | A kind of furfural modified crosslinking Chitosan Chelating Resin magnetic-particle and preparation method |
| CN105709698B (en) * | 2016-04-07 | 2018-09-28 | 浙江科技学院 | A kind of N- carboxyetbyl chitosans nanometer magnetic bead and its preparation method and application |
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| 《N,N-二羧甲基壳聚糖的制备及其盐的抑菌作用研究》;王进涛等;《化学与生物工程》;20100531;第27卷(第5期);第35-38页 * |
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